Before tickets for his 2018 tour went on sale - which includes four consecutive nights at the Principality Stadium - Sheeran announced that Twickets was the only site permitted to resell his tickets, and that tickets resold via any other reselling tickets would be 'invalid'.

(Image: Yui Mok/PA Wire)

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Fans have been warned they'll need to take their tickets and booking confirmation to the concerts, plus the card (or photocopy of it) which was used to buy the tickets and valid photo ID matching the name on the booking, reports MoneySavingExpert.com .

As part of the crackdown, up to 10,000 tickets - which Sheeran's team say have been bought by suspected touts making 'many multiple purchases' - have been cancelled before they were able to be resold.

But hundreds of fans are thought to have bought tickets via secondary sites which they're unlikely to be able to use.

Now the star's team has drafted a letter for fans, which it says provides evidence their tickets are invalid so they can hopefully claim their cash back.

How do I know if my ticket's valid?

It will be valid if you bought your ticket from an official ticket selling site when it was first put on sale. These are:

It will also be valid if it was purchased through Sheeran's official re-sale partner Twickets.co.uk

How can I get my money back if my ticket's not valid?

Sheeran's promoters, Kilimanjaro Live, have released a letter stating that tickets resold by any site other than Twickets will be 'invalid'. You can download the letter here via MoneySavingExpert.com

If your ticket is invalid then complain to the ticket reseller and demand a refund. Include a copy of the Kilimanjaro Live letter in your complaint as evidence that your ticket will be treated as invalid - and demand a refund of any admin fees you paid as well.

There's no guarantee this will work, but some sites have T&Cs which make it clear tickets sold via them must be valid.